How to Configure User Authentication and Access Control
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- Job Pope
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1 How to Configure User Authentication and Access Control For user authentication with the HTTP Proxy, the external authentication scheme that you can use depends on the proxy mode. With a transparent or reverse proxy, you can only use the Barracuda DC Agent. With the forwarding proxy, you can use either MS-CHAP or Kerberos for transparent authentication. In case these authentication methods fail, you can configure one of several other authentication schemes, such as NGF-Local, MS-AD, LDAP, or Radius, to serve as a fallback. To configure access control, you have the following options: Access Control Policy An access control policy is composed of ACL entries that define the connections to be restricted or allowed. An ACL entry can define IP addresses, domains, users, groups, browsers, MIME types, URLs, protocols, ports, connections, and times. Access control policies are processed one by one, according to their priority numbers. You can specify the priority of a policy when you create it. Access Control File List In addition to ACL entries and policies, you can also configure ACL file lists. ACL file lists are processed before ACL entries and policies. Legacy ACL Settings With this option, you can configure ACL files using the squid.conf syntax. From the command line, you can check the syntax of the squid.conf file. Depending on the HTTP Proxy mode, different authentication schemes are supported: Forward Proxy Mode MS-CHAP or Kerberos. For more information, see How to Configure MS-CHAP Authentication or How to Configure Kerberos Authentication. Forward Proxy Mode without transparent authentication In case MS-CHAPv2 or Kerberos are not available, you can configure an authentication fallback. Transparent Proxy Authentication DC Client. For more information, see How to Configure MSAD DC Client Authentication and Barracuda DC Agent for User Authentication. Configure User Authentication Step Enable User Authentication For the forward proxy, you can use either MS-CHAP or Kerberos. For the transparent or reverse proxy, only DC Client for authentication is supported Go to CONFIGURATION > Configuration Tree > Box > Virtual Servers > your virtual server > Assigned Services > HTTP Proxy Settings. Click Lock. In the left menu, select User Authentication. Next to Authentication Settings, click Set. To use MS-CHAPv2, edit the settings in the MS-CHAPv2 Settings section. To use Kerberos, edit the settings in the Kerberos Settings section. Click OK. Click Send Changes and Activate. Step (optional) Configure User Authentication for Forwarding Proxy Without Transparent Authentication In case MS-CHAPv2 or Kerberos is not available, you can configure an authentication fallback, e.g., NGF Local. 1 / 11
2 Go to CONFIGURATION > Configuration Tree > Box > Virtual Servers > your virtual server > Assigned Services > HTTP Proxy Settings. Click Lock. 3. In the left menu, select User Authentication. 4. In the Authentication Service Settings, configure:click OK. Authentication Text Enter a welcome message that is displayed when a user is prompted by the fallback authentication scheme. Authentication Scheme Select your fallback authentication scheme, e.g., NGF Local. Use FW Login as Authentication Select Yes. The HTTP Proxy service queries the firewall login status of the client. If the client is already authenticated, no further HTTP Proxy authentication is needed. User List Policy In case there are users that are not allowed to use the proxy service, select deny-explicit. In case only domain users listed in the User List are allowed to use the proxy service, select allow-only. User List Click + to add users to the list that must fulfill the User List policy. User names case sensitive Select yes if every single letter in the user name must match lower-case or capital letters; otherwise, select no. 5. Click Send Changes and Activate. Step 3. Configure Access Control Policy First create the ACL entries that are required by the policy. Next, create the access control policy by adding the ACL entries and selecting an action to handle them Go to CONFIGURATION > Configuration Tree > Box > Virtual Servers > your virtual server > Assigned Services > HTTP-Proxy > HTTP Proxy Settings. In the left menu, select Access Control. Click Lock. From the Default Access Control Policy list, select Allow. If no ACL Entries are configured and user authentication is used, the Default Access Control Policy is not applied and access control allows every authenticated user. 5. For each ACL, click + to add entries to the ACL Entries table: Enter a Name and click OK. Configure the Access Control Policy: ACL Priority Enter a number. Highest numbers are processed first. Action Select the action: Allow Deny Deny and redirect Enter an external Redirection address. Limit-Size Enter the Overall Maximum File Size (MB). Outgoing Address Set the Outgoing IP Address for the connection. Include Select additional ACL Files to include into the configuration. ACL Entries for this Action Select the ACL Entries this ACL is applied to. Before deleting an ACL entry, remove it from the ACL policies. ACL policies with broken links to non-existent ACL entries cause the HTTP proxy to fail. When configuring User Authentication ACL entries in combination with NTLM or MS-CHAP authentication, the username must be entered in the following format: DOMAIN\username. 2 / 11
3 6. In the Access Control Policies table, add the policy. Enter a name for the policy and click OK. In the Access Control Policies configuration window, specify the priority, required ACL entries, and action for the policy. Then click OK For more details on the settings that you can configure for the ACL entries or access control policies, see Access Control Settings. Click Send Changes and Activate. For examples and explanations on control policies, see Access Control Policy Example. Step 4. (optional) Configure Access Control File List Go to CONFIGURATION > Configuration Tree > Box > Virtual Servers > your virtual server > Assigned Services > HTTP-Proxy > HTTP Proxy Settings. In the left menu, select Access Control. In the left menu, expand the Configuration Mode section, and click Switch to Advanced View. Click Lock. From the Default Access Control Policy list, select Allow. In the ACL FileList table, add the ACL file list. Enter a name for the list, and click OK. The name must be numerical. It determines the priority of the ACL file list. To assign higher priority to the ACL file list, enter a lower number. In the ACL FileList window, configure the file list. Specify the following settings: Filename The name of the ACL file. By default, the file is saved to the /var/phion/preserve/proxy/<servername>_<servicename>/root/ directory. You can save the file to a different location, but this is not recommended. First verify that the destination directory has been properly created. When you specify the file name, add the absolute path to the destination directory. Do not use file names such as squid.conf and ftpsquid.conf; otherwise, you may lose configuration information. To avoid such situations, it is recommended that you use the default location and.acl as the file name extension. For example, aclfile.acl. ACL entries The entries that are written to the file. ACL entries are processed line by line. If a line must exceed 1012 characters, use the forward slash (/) to section lines. ACL entries must match the squid.conf syntax. They are not checked against squid.conf for compatibility. Do NOT use Inverted CIDR Notation. Access control policies will only apply if all ACL entries are met. For example, if you add three ACL entries to one policy, the policy only applies if all three ACL entries match Click OK. Click Send Changes and Activate. Step 5. (optional) Legacy ACL Settings If you must configure squid settings in legacy ACL in squid.conf syntax, enable the legacy ACL settings 3 / 11
4 mode Go to CONFIGURATION > Configuration Tree > Box > Virtual Servers > your virtual server > Assigned Services > HTTP-Proxy > HTTP Proxy Settings. In the left menu, select Access Control. From the Configuration Mode menu in the left navigation pane, click Switch to Advanced View. Click Lock. From the Default Access Control Policy list, select Allow. From the Access Configuration list, select legacy. Next to Legacy, click Set. 8. In the Access Control Entries field, enter your ACL entries. These entries must use the squid.conf syntax. You can enter complete ACLs, as well as entries from the ACL file list. Because your ACL entries are not checked against squid.conf for compatibility, make sure that you use the exact syntax. 9. Click OK. 10. Click Send Changes and Activate. The squid.conf file can be located at /var/phion/preserve/proxy/<servername_servicename>/root/. Check the squid.conf syntax To check the syntax of the squid.conf file from the command line, enter: squid -X -N -f /phion0/preserve/proxy/<servername_servicename>/root/squid.conf If there are any errors in your configuration, the number of the row that contains the error is printed. Access Control Policy Example On the Barracuda NextGen Firewall F-Series, Perl-compatible regular expressions (PCRE) can be used (for example, in the HTTP Proxy server ACL configuration section). You can use PCRE when you want to substitute hard-coded character strings against expressions that match in multiple cases. For an overview of metacharacters in regular expressions, see Regular Expressions. These sections provide steps to configure two example access control policies and an explanation of how the policies are processed: Creating the Example Access Control Policies This example procedure configures two access control policies that limit FTP and HTTP access for a client at to the following days and times: Access Control Policy Access Times 4 / 11
5 FTP Access Mondays, 08:00-12:00 and 14:00-17:00 HTTP Access Mondays to Fridays, 08:00-17:00 First create all of the required ACL entries. Then add these entries to the policies Go to CONFIGURATION > Configuration Tree > Box > Virtual Servers > your virtual server > Assigned Services > HTTP-Proxy > HTTP Proxy Settings. In the left menu, select Access Control. Click Lock. From the Default Access Control Policy list, select Allow. In the ACL Entries table, create these ACL entries: ACL Entry Name clientpc ACL Entry Type Source IP IP Configuration: Singlemode Set IPs: portftp TCP-Port Specify Destination Port Address: 21 porthttp TCP-Port Specify Destination Port Address: 80 protocolftp Protocol Define Transfer Protocol: FTP protocolhttp Protocol Define Transfer Protocol: HTTP Settings Access is enabled Mondays from 08:00 to 12:00 and 14:00 to 17:00: timeftp Time Restrictions Access is enabled Mondays to Fridays from 08:00 to 17:00: timeweb Time Restrictions After all of the required ACL entries are created, they are displayed in the ACL Entries table as follows: 5 / 11
6 In the squid.conf file, the days of the week are stated as follows: M Monday T Tuesday W Wednesday H Thursday F Friday A Saturday S Sunday For the example timeftp and timehttp settings, the following ACL entries are generated in squid.conf for all of the times when access is enabled: timeftp acl mytime time M 08:00-12:00 acl mytime time M 14:00-17:00 There are two entries for Monday because access is enabled from 8:00 to 12:00, restricted from 12:00 to 14:00, and then re-enabled from 14:00 to 17:00. timehttp acl mytime time M 08:00-17:00 acl mytime time T 08:00-17:00 acl mytime time W 08:00-17:00 acl mytime time H 08:00-17:00 acl mytime time F 08:00-17:00 6. In the Access Control Policies table, create these access control policies: Access Control Policy Name webaccess ftpaccess Settings ACL Priority: 1 Action: Allow ACL Entries for this Action: clientpc porthttp protocolhttp timeweb ACL Priority: 2 Action: Allow ACL Entries for this Action: clientpc portftp protocolftp timeftp 6 / 11
7 After the access control policies are created, they are displayed in the Access Control Policies as follows: In squid.conf, the following lines are generated for the example webaccess and ftpaccess policies: http_access allow clientpc porthttp protocolhttp timeweb http_access allow clientpc portftp protocolftp timeftp Processing the Example Policies When the HTTP proxy URL filter is configured with the example webaccess and ftpaccess policies, it grants access to connections that match the ACL entries that are included in the policies. To determine if access should be granted, the HTTP proxy URL filter first processes the webaccess policy (which has higher priority) for a match. If the connection does not match the webaccess policy, the ftpaccess policy is then processed. The policies are processed as follows: If clientpc AND porthttp AND protocolhttp AND timeweb are TRUE, grant access and stop processing rules. Otherwise, proceed to the next rule. If clientpc AND portftp AND protocolftp AND timeftp are TRUE, grant access. Example Scenarios It is Monday at 9:00. If a user at tries to access the Internet on port 80, the first rule is processed. The connection is allowed by the http_access rule because clientpc AND porthttp AND protocolhttp AND timeweb are TRUE. No other rules are processed. It is Monday at 18:00. If a user at tries to access an FTP server on port 21, the the first rule is processed and determined to be FALSE because the connection does not match any criteria except for clientpc. Subsequently, the second rule is processed, but it is determined that the connection does not match timeftp. The connection attempt is then rejected because it does not match both rules. Access Control Settings These sections provide more detailed descriptions of the settings that you configure for ACL entries and access control policies: ACL Entries Settings This table provides descriptions of the setting that you can configure for each ACL entry type: ACL Type Description 7 / 11
8 Time Restrictions Source IP Destination IP Source IPv6 Destination IPv6 Source Domain Destination Domain User Authentication Groups Defines times and days. For this ACL entry type, you can configure the following settings: Time Zone Select one of the following options to specify which time zone to use: Use Local Box Time Zone Uses the local time zone of the system. explicit Uses the time zone that is selected from the following Time Zone list. Time Settings Click Always and then select the required days and times in the Time Interval window. If specific days and times have already been selected for the time restriction, Always is changed to Restricted. By default, the configuration is always active. Use Extended Time List Enables the days and times that are listed in the Extended Time List table instead of those that are configured in the Time Settings section. (This setting is only available if Advanced View is selected from the Configuration Mode menu on the left.) Extended Time List In this table, add an entry for each day of the week. For each day, specify the times to include. If time restriction applies, the label of the button changes to Restricted!. Defines the source or destination IP address of a connection. For these ACL entry types, you can configure the following settings: IP Configuration From this list, select one of the following options to specify if you are adding specific IP addresses or a range of IP addresses: Singlemode Select to add specific IP addresses. Rangemode Select to add a range of IP addresses. NextGen Admin Settings applies if activated. IP Ranges From To In these fields, enter the first and last IP addresses in the IP range. Single IPs In this section, add specific IP addresses to the Set IPs table. Defines client domains. Add the domains to the Domains table. Include a dot before the domain names. Example:.barracuda.com. Processing delays may be caused when using domain names. Squid needs to reverse DNS lookups (from client IP address to client domain name) before it can interpret the ACL. Defines users who must authenticate themselves in an external authentication program. For this ACL entry type, you can configure the following settings: Required for All Users Specifies if all users or only select users using the proxy must authenticate themselves. From this list, you can select: yes All users must be authenticated. no Only certain users must be authenticated. Add these users to the following Users table. Users If only certain users must be authenticated, add their usernames to this table. Defines groups. In case you want to access MSAD-groups with NTLM via MSCHAP, you must configure the MSAD authentication service to provide this information. For more information, see How to Configure MSAD Authentication. For this ACL entry type, you can configure the following settings: Interpret as RegEx If the groups list contains regular expressions and matching should be possible for RegEx meta-symbols, select Yes. When this setting is enabled, the Partial Search and Case Insensitive settings are disabled. If there is only one meta-symbol * or it is the first one in a RegEx, enter it by a leading. (dot). Partial Search To enable partial pattern matching, select Yes. Case insensitive If group matching is case insensitive, select Yes. Groups In this table, add metadirectory group patterns. Group names are the distinguished names of metadirectories. Example for LDAP: CN=myname, OU=myOU, DC=com 8 / 11
9 URL Path URL Maximum Connections Protocol Requestmethod TCP Port Browser Mime Types URL Filter Categories External Defines URL path regular expressions (urlpath_regex) that match the URL, but not the protocol or hostname. In the URL Path Extensions table, add regular expressions, words, or word patterns. All entries are treated as case-insensitive. The urlpath_regex looks for the specified value in the URL path following the hostname. For example, with the word "example" will only be looked for within the path "/example/domain/index.htm". Defines URL extensions (url_regex) considering protocol and hostname (ACL Type = urlextension). In the URL Path Extensions table, add regular expressions, words, or word patterns. All entries are treated as case-insensitive. The url_regex looks for the specified value in the URL path including the protocol and hostname. Defines the maximum number of connections from a single client IP address. In the Define Maximum Connections field, enter this limit. The value of the ACL is TRUE if the limit is exceeded. Defines a list of protocols. In the Define Transfer Protocol table, add transfer protocols such as HTTP. Defines a list of request methods. In the Define Request Method table, add request methods such as GET, POST, or UPDATE. Defines a destination's port address. In the Specify Destination Port Address field, enter the destination server s port number. Defines regular expression patterns or words, matching the user-agent header transmitted during the request. In the Define Browser Access table, add the regular expressions or words. For example, if you add Firefox, it will be searched for in the user-agent header of an incoming request. Defines a list of MIME types. In the Mime Types table, add mime type expressions. For more information, see Defines an ACL consisting of URL filter categories. For this ACL entry type, you can configure the following settings: URL Filter Categories In this table, add the URL filter categories. Num Categorize Helpers The number of helpers for URL Filter categorization. Defines an ACL by using external helper programs. For this ACL entry type, you can configure the following settings: External Group Uses an existing external helper or a new one. External ACL Format Defines the ACL input format, for example: the external ACL input type. External ACL Binary Import dialogue for external ACL binaries/scripts. External ACL Binary Parameter Parameter that will be passed to the external ACL helper program/script. External Group Reference Select a pre-defined external group ACL. External ACL Parameter Parameter for the defined external ACL. Access Control Policies Settings This table provides descriptions of the settings that you can configure for access control policies: ACL Priority Action Setting Description Enter a number to specify the priority for this policy. To assign higher priority to a policy, enter a lower number. Access control policies with higher priority are processed first. Specifies how to handle the ACL entries that are added to this policy. You can select Allow, Deny or, Limit-Size. 9 / 11
10 ACL Entries for this Action Overall Maximum File Size ACL Policy Description In this table, add the ACL entries to which the selected action will be applied. Access control policies will only apply if all ACL entries are met. For example, if you add three ACL entries to one policy, the policy only applies if all three ACL entries match. When you delete an ACL entry, you must also delete it from any access control policies that it has been added to. If the selected action for this policy is Limit-Size, enter the maximum size of files that can be downloaded. To disable this setting, enter 0. This setting may be configured more granularly as ACL. Brief description of the policy action and the ACL entries that it affects. 10 / 11
11 Figures 11 / 11
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